What are Gear Pumps? Gear pumps are positive displacement pumps that use mechanical action to move fluids by trapping a fixed amount between gears and transferring it. Unlike centrifugal pumps, which rely on velocity to create pressure, gear pumps physically compress the fluid. There are two main gear pumps: external gear pumps, which use two identical gears that mesh together, and internal gear pumps, where one gear is placed inside another. Invented in the 17th century by Johannes Kepler, gear pumps are commonly used in hydraulic systems and for handling thick fluids. They are self-priming and ideal for applications requiring lower flow rates and higher pressures. Fluids discharged from a gear pump typically flow with low-pressure pulsations, resulting in a smooth and consistent flow. The flow rate is directly linked to the speed of the gears, making gear pumps ideal for applications where precise flow measurement is needed. Electric motors usually power gear pumps, but they ca...